American Airlines Appeals Ruling That Ended JetBlue Alliance

American Airlines Group Inc. appealed a federal court ruling that found its alliance with JetBlue Airways Corp. violated antitrust law and amounted to a de facto merger.

In a Monday filing in the US District Court for the District of Massachusetts, American announced its appeal to the US Court of Appeals for the First Circuit in Boston. Company executives committed to appeal in May.

Judge Leo Sorokin agreed in a May ruling with the Justice Department in finding that the Northeast Alliance between the two carriers—which allowed them to share routes, passengers, flight slots, and revenue between New York City ...